Radar vs Sentry
Radar and Sentry are both uptime & monitoring tools. Radar is aimed at developers and small businesses, while Sentry is aimed at developers. Sentry costs less, from $29/mo versus $149/mo for Radar. Both have a free plan.
Open-source Kubernetes UI and MCP server for engineers and agents
Error and performance monitoring
| Pricing | Open source · $149 | Freemium · $29 |
| Starting price | $149/mo | $29/mo |
| Free plan | Yes | Yes |
| Free trial | 14 days | 14 days |
| Built for | Developers, Small businesses, Enterprise | Developers |
| Platforms | web, macos, windows, linux | web |
| Country | IL · 2023 | US · 2012 |
| Rating | — | — |
Choose Radar if
Platform and DevOps teams that want a free open-source Kubernetes UI and a safe way to give AI agents cluster context.
- Fully featured open-source build under Apache 2.0
- Single binary and desktop app for macOS, Windows and Linux, no account needed
- Read-only MCP endpoint lets agents inspect clusters safely
Look elsewhere if: Teams that need full-stack metrics, logs and APM in one hosted suite (Datadog, Dynatrace).
Choose Sentry if
Engineering teams of any size that want to know when and why code breaks.
- Best developer experience for debugging errors
- SDKs for everything
- Free tier for individuals
Look elsewhere if: Infrastructure metrics and logs at scale (Datadog, Grafana).
Radar vs Sentry pricing
Radar
- Radar OSS$0Apache 2.0, unlimited clusters, one cluster at a time
- Cloud Free$03 hosted clusters, unlimited users, 100 investigations/mo
- Team$149/cluster/moScoped RBAC, fleet cost rollup; 20% off annual contracts
- Enterprise$299/cluster/moSSO, SCIM, SIEM export, self-managed; 20% off annual contracts
- CustomCustomAnnual contract, air-gapped, data residency, 99.9% SLA
Sentry
- Developer$01 user, 5k errors, 5 GB logs
- Team$29/mo$26/mo billed annually; unlimited users, 50k errors
- Business$89/mo$80/mo billed annually; 50k errors, 90-day lookback
- EnterpriseCustomCustom quotas and support
Radar · Key features
- Issues queue that groups failures by root cause and blast radius
- Live topology graph and resource browser for any conformant cluster
- Event and change timeline with diffs beyond the one-hour default
- Helm release views with upgrades and rollbacks
- Argo CD and Flux drift detection, diagnosis and sync
- Cluster audit with 44 best-practice checks
Cons
- Per-cluster pricing gets expensive for large fleets
- Radar Cloud SSO and SCIM only on the $299 Enterprise plan
- Team plan keeps just 3 days of timeline history
Sentry · Key features
- Error tracking with stack traces, breadcrumbs and release tracking
- Performance tracing and profiling
- Session Replay tied to errors
- Cron and uptime monitoring
- Seer AI for root cause and fix suggestions
- Suspect commits, issue ownership and alerting rules
Cons
- Costs scale with event volume; sampling needed
- Self-hosting is heavy
- Alert noise without tuning
Radar vs Sentry: FAQ
Which is cheaper, Radar or Sentry?
Sentry starts at $29/mo and Radar at $149/mo. Both prices are checked on the vendors' own pricing pages.
Do Radar and Sentry have a free plan?
Yes, both Radar and Sentry have a free plan; paid plans add more usage and features.
Which is better for small businesses, Radar or Sentry?
Radar lists small businesses as a core audience, while Sentry is aimed more at developers.